Update the code the section Configuration

[makraz]

This PR to fix the code in the section Configuration because when you copy/paste the code from it, you get the following error:

[github-actions]

Thanks for your pull request! We love contributions.

However, you should instead open a pull request on the main repository:

https://github.com/symfony/ux

This repository is what we call a "subtree split": a read-only subset of that main repository.

We're looking forward to your PR there!